| Convert Array to Set.GeeksForGeeks<pid="GFG_UP"style="font-size:15px; font-weight:bold;">click here<pid="GFG_DOWN"style="color:green; font-size:20px; font-weight:bold;">varup =document.getElementById('GFG_UP');vardown =document.getElementById('GFG_DOWN');varA = [1,1,2,2,...
解决方法: 可以使用Set来去除数组中的重复元素,然后再将Set转换回数组。 代码语言:txt 复制 let arrayWithDuplicates = [1, 2, 2, 3, 4, 4, 5]; let uniqueArray = [...new Set(arrayWithDuplicates)]; // [1, 2, 3, 4, 5] 在这个例子中,Set自动去除了重复的元素,然后使用扩展运算符...将Set...
const s = new Set(); // 创建时赋值 const colors = new Set(['red',white,'blue']); 1. 2. 3. 4. 5. 也可传入数组创建set,但若数组内存在相同元素,则会去重! let list = [1, 2, 3, 3]; let my_set = new Set(list); console.log(my_set); // 打印 Set(3) { 1, 2, 3 }...
javascript基础1,主要写(==和===的区别), Array对象, Object对象, this关键字,短路操作,Set集合,Map集合和String字符串操作。 1. == , === 1. === 在js中需要值相等类型相等 2. == 在js中值相等,类型不相等会自动转换 2.Array 全部Array的接口可以查看https://developer.mozilla.org/zh-CN/docs/Web...
keyValArr=[...map]//将map转换成数组(忽略key取value)arr=[...map.values()]//将map转回对象obj=Object.fromEntries(map)//将键值对数组转换回对象obj=Object.fromEntries(keyValArr)//将数组转为Set 若数组存在重复元素将自动去重let set=newSet(arr)//将set转换回数组arr=[...set] ...
();user.setId(001);user.setName("guest");User user1=newUser();user1.setId(002);user1.setName("root");List<User>users=newArrayList<User>();users.add(user);users.add(user1);group.setUsers(users);String json=JSON.toJSONString(group);System.out.println(json);// 输出: {"id":0,...
map.set(1, '111').set(2, '222').set(3, '333'); // 使用for of function mapToObj (map) { var obj = {}; for (let [key, value] of map) { obj[key] = value; } return obj; } // 借助Map转成JSON字符串 function mapToJSONStr(map) { return JSON.stringify(mapToObj(map))...
The [[Class]] property of the newly constructed object is set to “Array”. 于是利用这点,第三种方法登场了。 AI检测代码解析 1 function isArray(obj) { 2 return Object.prototype.toString.call(obj) === '[object Array]'; 3 } 1.
For example, you might take a contiguous slice (subset) of an array, filter an array using a predicate function, or map an array to a parallel set of values using a transform function. Before looking at the methods that d3-array provides, familiarize yourself with the powerful array ...
constgetUserInfo ==>{returnnewPromise((rs) =>{setTimeout(=>{rs({name:'fatfish'})},2000)})}// If you want to use await, you must use the async function.constfetch =async=> {constuserInfo =awaitgetUserInfoconsole.log('userInfo', userInfo)} ...